GROUP MEMBERS :

ABSTRACT :

ABSTRACT When the cell phone detector signal is detected by C3, the output of IC1 becomes high and low alternately according to the frequency of the signal as indicated by LED1.
This triggers monostable timer IC2 through capacitor C7.
Capacitor C6 maintains the base bias of transistor T1 for fast switching action.
The low-value timing components R6 and C9 produce very short time delay to avoid audio nuisance.
The moment the bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases.

INTRODUTION :

INTRODUTION This handy cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters.
So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc.
It is also useful for detecting the use of mobile phone for spying and unauthorized video transmission.
The circuit can detect both the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode.

BLOCK DIAGRAM :

BLOCK DIAGRAM

Slide 6:

CIRCUIT DIAGRAM

ANTENNA :

ANTENNA The size and shape of the antenna and the way it's constructed determine the gain and directivity of the antenna.
The antenna transmits and receives electromagnetic signals.
When gain increases the amount of desired
signal energy that can be captured Increase
but the amount of environmental noise and
interferences that's captured increases by the
same amount.

IC CA3130 :

IC CA3130 Op-amp IC CA3130 (IC1) is used in the circuit as a current-to-voltage converter
It is a CMOS version using gate-protected p-channel MOSFET transistors in the input to provide very high input impedance, very low input current and
very high speed of
performance
The output CMOS
transistor is capable
of swinging the output
within 10mv of either
supply voltage terminals

NE555 :

NE555 The NE555 is a highly stable controller capable of producing accurate timing pulses.
With a monostable operation,time delay is controlled by one external resistor and
one capacitor.
With an astable
operation,frequency
and duty cycle are
accurately controlled
by two external
resistors and one capacitor

PIEZO-EIECTRIC BUFFER :

PIEZO-EIECTRIC BUFFER A piezoelectric sensor is a device that uses the piezoelectric effect to measure pressure, acceleration, strain or force by converting them to an electrical signal.
A piezoelectric disk generates a voltage
when deformed
They are used for quality assurance,
process control and for research and
development in many different industries.

LED :

LED An electronic device that lights up when electricity is passed through it. LEDs are usually red. They are good for displaying images because they can be relatively small.
The moment the bug detects
RF transmission signal from an
activated mobile phone, it
starts sounding a beep alarm
and the LED blinks.
LED’s contain an integrated
multivibrator circuit inside which
causes the LED to flash with a
typical time period.

FUTURE ENHANCEMENT :

FUTURE ENHANCEMENT This project for military and civil defence for mobile radiation detection.
Used for spying the unauthorised
video transmission in mobile phones.
Used to prevent the usage of mobile phones in examination and seminar halls.
The signals emitted by mobile phones can interfere with some electronic equipment inside the hospital. This could have fatal consequences.so we use this project to detect the usage of mobile phones in the above places.

conclusion :

conclusion By choosing this project, we have not only learnt the technology of detection of cell phones during the fraudulent usage, but also got interested to enrich our knowledge
in the field of electronics.